Comment: an addition to my 100+year old house was added on in the 1960's..two rooms over a two car garage were added..the garage is concrete block on one side and concrete on the other sides...i have a floor to ceiling crack or separation in the block and due to flooding this spring a large crack in the concrete flooring running front to baack.. for several years the opposite wall had been wet and paint is peeling and moldy...this wall has dirt behind it and the old part of the house is next to and over this damp wall.